./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i --full-output --architecture 64bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-64bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 64bit --witnessprinter.graph.data.programhash 1bad5b7f91b61cdf9d4f1ace01330b8d7c80f8ede0ca40c43d18f706f54101eb --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:55:58,048 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:55:58,051 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:55:58,107 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:55:58,107 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:55:58,109 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:55:58,111 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:55:58,114 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:55:58,117 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:55:58,125 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:55:58,126 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:55:58,130 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:55:58,131 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:55:58,141 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:55:58,143 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:55:58,145 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:55:58,146 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:55:58,147 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:55:58,150 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:55:58,153 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:55:58,160 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:55:58,162 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:55:58,170 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:55:58,171 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:55:58,187 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:55:58,187 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:55:58,188 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:55:58,191 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:55:58,192 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:55:58,194 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:55:58,195 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:55:58,197 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:55:58,199 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:55:58,201 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:55:58,203 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:55:58,203 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:55:58,204 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:55:58,204 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:55:58,205 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:55:58,210 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:55:58,211 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:55:58,212 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-64bit-Taipan_Default.epf [2021-11-21 00:55:58,275 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:55:58,275 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:55:58,275 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:55:58,276 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:55:58,277 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:55:58,277 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:55:58,277 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:55:58,277 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:55:58,278 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:55:58,278 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:55:58,280 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:55:58,281 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:55:58,281 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:55:58,281 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:55:58,282 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:55:58,282 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:55:58,282 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:55:58,283 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:55:58,283 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:55:58,284 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:55:58,284 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:55:58,284 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:55:58,284 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:55:58,285 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:55:58,285 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:55:58,286 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:55:58,287 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:55:58,288 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:55:58,289 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:55:58,289 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:55:58,289 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:55:58,290 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:55:58,290 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:55:58,290 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:55:58,290 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:55:58,291 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:55:58,292 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:55:58,292 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:55:58,292 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 64bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1bad5b7f91b61cdf9d4f1ace01330b8d7c80f8ede0ca40c43d18f706f54101eb [2021-11-21 00:55:58,624 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:55:58,651 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:55:58,655 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:55:58,656 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:55:58,657 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:55:58,659 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i [2021-11-21 00:55:58,752 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/data/e41b2b672/bc38b9ce2d59402ebfbf2341b98cb098/FLAG40a8531d3 [2021-11-21 00:55:59,755 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:55:59,756 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i [2021-11-21 00:55:59,796 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/data/e41b2b672/bc38b9ce2d59402ebfbf2341b98cb098/FLAG40a8531d3 [2021-11-21 00:56:00,183 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/data/e41b2b672/bc38b9ce2d59402ebfbf2341b98cb098 [2021-11-21 00:56:00,186 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:56:00,187 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:56:00,190 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:56:00,190 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:56:00,220 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:56:00,220 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:56:00" (1/1) ... [2021-11-21 00:56:00,222 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@98cd326 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:56:00, skipping insertion in model container [2021-11-21 00:56:00,222 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:56:00" (1/1) ... [2021-11-21 00:56:00,231 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:56:00,357 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:56:01,620 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i[144238,144251] [2021-11-21 00:56:01,639 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:56:01,669 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:56:02,073 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/sv-benchmarks/c/ldv-validator-v0.8/linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i[144238,144251] [2021-11-21 00:56:02,080 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:56:02,147 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:56:02,147 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:56:02 WrapperNode [2021-11-21 00:56:02,148 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:56:02,149 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:56:02,149 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:56:02,150 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:56:02,159 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:56:02" (1/1) ... [2021-11-21 00:56:02,244 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:56:02" (1/1) ... [2021-11-21 00:56:02,381 INFO L137 Inliner]: procedures = 115, calls = 787, calls flagged for inlining = 53, calls inlined = 52, statements flattened = 1905 [2021-11-21 00:56:02,382 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:56:02,385 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:56:02,386 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:56:02,386 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:56:02,398 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:56:02" (1/1) ... [2021-11-21 00:56:02,398 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:56:02" (1/1) ... [2021-11-21 00:56:02,430 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:56:02" (1/1) ... [2021-11-21 00:56:02,431 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:56:02" (1/1) ... [2021-11-21 00:56:02,542 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:56:02" (1/1) ... [2021-11-21 00:56:02,576 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:56:02" (1/1) ... [2021-11-21 00:56:02,589 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:56:02" (1/1) ... [2021-11-21 00:56:02,615 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:56:02,616 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:56:02,616 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:56:02,616 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:56:02,617 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:56:02" (1/1) ... [2021-11-21 00:56:02,630 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:56:02,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:56:02,663 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:56:02,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:56:02,732 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2021-11-21 00:56:02,732 INFO L130 BoogieDeclarations]: Found specification of procedure usb_submit_urb [2021-11-21 00:56:02,732 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_submit_urb [2021-11-21 00:56:02,733 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~$Pointer$ [2021-11-21 00:56:02,733 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~$Pointer$ [2021-11-21 00:56:02,733 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_stop [2021-11-21 00:56:02,733 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_stop [2021-11-21 00:56:02,734 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 00:56:02,734 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2021-11-21 00:56:02,734 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2021-11-21 00:56:02,734 INFO L130 BoogieDeclarations]: Found specification of procedure usb_endpoint_xfer_int [2021-11-21 00:56:02,735 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_endpoint_xfer_int [2021-11-21 00:56:02,735 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memcpy [2021-11-21 00:56:02,735 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memcpy [2021-11-21 00:56:02,735 INFO L130 BoogieDeclarations]: Found specification of procedure __create_pipe [2021-11-21 00:56:02,735 INFO L138 BoogieDeclarations]: Found implementation of procedure __create_pipe [2021-11-21 00:56:02,735 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_malloc [2021-11-21 00:56:02,736 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_malloc [2021-11-21 00:56:02,736 INFO L130 BoogieDeclarations]: Found specification of procedure usb_kill_urb [2021-11-21 00:56:02,736 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_kill_urb [2021-11-21 00:56:02,736 INFO L130 BoogieDeclarations]: Found specification of procedure kfree [2021-11-21 00:56:02,736 INFO L138 BoogieDeclarations]: Found implementation of procedure kfree [2021-11-21 00:56:02,737 INFO L130 BoogieDeclarations]: Found specification of procedure usb_get_serial_port_data [2021-11-21 00:56:02,737 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_get_serial_port_data [2021-11-21 00:56:02,737 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 00:56:02,737 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_check_tty [2021-11-21 00:56:02,737 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_check_tty [2021-11-21 00:56:02,738 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_init_zalloc [2021-11-21 00:56:02,738 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_init_zalloc [2021-11-21 00:56:02,738 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-21 00:56:02,738 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-21 00:56:02,739 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_detach_1 [2021-11-21 00:56:02,739 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_detach_1 [2021-11-21 00:56:02,739 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-21 00:56:02,739 INFO L130 BoogieDeclarations]: Found specification of procedure ldv_memset [2021-11-21 00:56:02,739 INFO L138 BoogieDeclarations]: Found implementation of procedure ldv_memset [2021-11-21 00:56:02,740 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:56:02,740 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_tiocmset [2021-11-21 00:56:02,740 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_tiocmset [2021-11-21 00:56:02,740 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_tiocmget [2021-11-21 00:56:02,740 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_tiocmget [2021-11-21 00:56:02,741 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 00:56:02,741 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-21 00:56:02,741 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-21 00:56:02,798 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_ioctl [2021-11-21 00:56:02,799 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_ioctl [2021-11-21 00:56:02,799 INFO L130 BoogieDeclarations]: Found specification of procedure usb_control_msg [2021-11-21 00:56:02,799 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_control_msg [2021-11-21 00:56:02,799 INFO L130 BoogieDeclarations]: Found specification of procedure usb_free_urb [2021-11-21 00:56:02,799 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_free_urb [2021-11-21 00:56:02,799 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_write_room [2021-11-21 00:56:02,800 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_write_room [2021-11-21 00:56:02,800 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 00:56:02,800 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2021-11-21 00:56:02,800 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_init_termios [2021-11-21 00:56:02,800 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_init_termios [2021-11-21 00:56:02,800 INFO L130 BoogieDeclarations]: Found specification of procedure usb_serial_deregister [2021-11-21 00:56:02,801 INFO L138 BoogieDeclarations]: Found implementation of procedure usb_serial_deregister [2021-11-21 00:56:02,801 INFO L130 BoogieDeclarations]: Found specification of procedure kzalloc [2021-11-21 00:56:02,801 INFO L138 BoogieDeclarations]: Found implementation of procedure kzalloc [2021-11-21 00:56:02,801 INFO L130 BoogieDeclarations]: Found specification of procedure kmalloc [2021-11-21 00:56:02,801 INFO L138 BoogieDeclarations]: Found implementation of procedure kmalloc [2021-11-21 00:56:02,801 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:56:02,802 INFO L130 BoogieDeclarations]: Found specification of procedure kobil_set_termios [2021-11-21 00:56:02,802 INFO L138 BoogieDeclarations]: Found implementation of procedure kobil_set_termios [2021-11-21 00:56:02,802 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~int [2021-11-21 00:56:02,802 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:56:02,802 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:56:03,391 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:56:03,394 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:56:03,685 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint ldv_stopFINAL: assume true; [2021-11-21 00:56:08,705 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:56:09,307 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:56:09,308 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-21 00:56:09,314 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:56:09 BoogieIcfgContainer [2021-11-21 00:56:09,315 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:56:09,317 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:56:09,317 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:56:09,322 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:56:09,322 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:56:00" (1/3) ... [2021-11-21 00:56:09,323 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d0ef05f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:56:09, skipping insertion in model container [2021-11-21 00:56:09,324 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:56:02" (2/3) ... [2021-11-21 00:56:09,324 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d0ef05f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:56:09, skipping insertion in model container [2021-11-21 00:56:09,325 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:56:09" (3/3) ... [2021-11-21 00:56:09,328 INFO L111 eAbstractionObserver]: Analyzing ICFG linux-stable-1dfa93a-1-100_1a-drivers--usb--serial--kobil_sct.ko-entry_point_ldv-val-v0.8.cil.out.i [2021-11-21 00:56:09,335 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:56:09,336 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 00:56:09,422 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:56:09,436 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 00:56:09,437 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 00:56:09,494 INFO L276 IsEmpty]: Start isEmpty. Operand has 407 states, 266 states have (on average 1.3834586466165413) internal successors, (368), 273 states have internal predecessors, (368), 114 states have call successors, (114), 26 states have call predecessors, (114), 25 states have return successors, (109), 109 states have call predecessors, (109), 109 states have call successors, (109) [2021-11-21 00:56:09,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-21 00:56:09,529 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:56:09,530 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:56:09,531 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:56:09,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:56:09,538 INFO L85 PathProgramCache]: Analyzing trace with hash 850965209, now seen corresponding path program 1 times [2021-11-21 00:56:09,550 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:56:09,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714824297] [2021-11-21 00:56:09,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:56:09,553 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:56:10,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:56:10,403 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-21 00:56:10,404 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:56:10,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714824297] [2021-11-21 00:56:10,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1714824297] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:56:10,405 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:56:10,406 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:56:10,408 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690614127] [2021-11-21 00:56:10,409 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:56:10,414 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:56:10,426 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:56:10,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:56:10,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:56:10,469 INFO L87 Difference]: Start difference. First operand has 407 states, 266 states have (on average 1.3834586466165413) internal successors, (368), 273 states have internal predecessors, (368), 114 states have call successors, (114), 26 states have call predecessors, (114), 25 states have return successors, (109), 109 states have call predecessors, (109), 109 states have call successors, (109) Second operand has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 2 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2021-11-21 00:56:13,231 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:56:13,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:56:13,359 INFO L93 Difference]: Finished difference Result 839 states and 1224 transitions. [2021-11-21 00:56:13,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:56:13,363 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 2 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) Word has length 99 [2021-11-21 00:56:13,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:56:13,390 INFO L225 Difference]: With dead ends: 839 [2021-11-21 00:56:13,391 INFO L226 Difference]: Without dead ends: 443 [2021-11-21 00:56:13,404 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:56:13,425 INFO L933 BasicCegarLoop]: 510 mSDtfsCounter, 109 mSDsluCounter, 448 mSDsCounter, 0 mSdLazyCounter, 257 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 109 SdHoareTripleChecker+Valid, 885 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 257 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.7s IncrementalHoareTripleChecker+Time [2021-11-21 00:56:13,426 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [109 Valid, 885 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 257 Invalid, 1 Unknown, 0 Unchecked, 2.7s Time] [2021-11-21 00:56:13,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 443 states. [2021-11-21 00:56:13,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 443 to 443. [2021-11-21 00:56:13,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 443 states, 299 states have (on average 1.3612040133779264) internal successors, (407), 301 states have internal predecessors, (407), 113 states have call successors, (113), 30 states have call predecessors, (113), 30 states have return successors, (113), 113 states have call predecessors, (113), 113 states have call successors, (113) [2021-11-21 00:56:13,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 443 states to 443 states and 633 transitions. [2021-11-21 00:56:13,609 INFO L78 Accepts]: Start accepts. Automaton has 443 states and 633 transitions. Word has length 99 [2021-11-21 00:56:13,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:56:13,611 INFO L470 AbstractCegarLoop]: Abstraction has 443 states and 633 transitions. [2021-11-21 00:56:13,612 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 2 states have call successors, (15), 2 states have call predecessors, (15), 1 states have return successors, (14), 2 states have call predecessors, (14), 2 states have call successors, (14) [2021-11-21 00:56:13,614 INFO L276 IsEmpty]: Start isEmpty. Operand 443 states and 633 transitions. [2021-11-21 00:56:13,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2021-11-21 00:56:13,627 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:56:13,628 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:56:13,628 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:56:13,628 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:56:13,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:56:13,630 INFO L85 PathProgramCache]: Analyzing trace with hash 494757028, now seen corresponding path program 1 times [2021-11-21 00:56:13,630 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:56:13,631 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751843600] [2021-11-21 00:56:13,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:56:13,631 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:56:13,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:56:13,909 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2021-11-21 00:56:13,909 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:56:13,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751843600] [2021-11-21 00:56:13,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [751843600] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:56:13,910 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:56:13,911 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:56:13,911 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693872492] [2021-11-21 00:56:13,911 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:56:13,913 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:56:13,913 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:56:13,914 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:56:13,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:56:13,915 INFO L87 Difference]: Start difference. First operand 443 states and 633 transitions. Second operand has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) [2021-11-21 00:56:16,432 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.86s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:56:17,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:56:17,202 INFO L93 Difference]: Finished difference Result 1040 states and 1490 transitions. [2021-11-21 00:56:17,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:56:17,204 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) Word has length 153 [2021-11-21 00:56:17,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:56:17,219 INFO L225 Difference]: With dead ends: 1040 [2021-11-21 00:56:17,222 INFO L226 Difference]: Without dead ends: 631 [2021-11-21 00:56:17,224 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:56:17,227 INFO L933 BasicCegarLoop]: 552 mSDtfsCounter, 245 mSDsluCounter, 447 mSDsCounter, 0 mSdLazyCounter, 292 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 245 SdHoareTripleChecker+Valid, 927 SdHoareTripleChecker+Invalid, 337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:56:17,230 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [245 Valid, 927 Invalid, 337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 292 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2021-11-21 00:56:17,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 631 states. [2021-11-21 00:56:17,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 631 to 629. [2021-11-21 00:56:17,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 629 states, 437 states have (on average 1.334096109839817) internal successors, (583), 440 states have internal predecessors, (583), 143 states have call successors, (143), 48 states have call predecessors, (143), 48 states have return successors, (143), 143 states have call predecessors, (143), 143 states have call successors, (143) [2021-11-21 00:56:17,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 629 states to 629 states and 869 transitions. [2021-11-21 00:56:17,318 INFO L78 Accepts]: Start accepts. Automaton has 629 states and 869 transitions. Word has length 153 [2021-11-21 00:56:17,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:56:17,321 INFO L470 AbstractCegarLoop]: Abstraction has 629 states and 869 transitions. [2021-11-21 00:56:17,322 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.666666666666668) internal successors, (53), 3 states have internal predecessors, (53), 3 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) [2021-11-21 00:56:17,322 INFO L276 IsEmpty]: Start isEmpty. Operand 629 states and 869 transitions. [2021-11-21 00:56:17,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-21 00:56:17,327 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:56:17,328 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:56:17,328 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 00:56:17,329 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:56:17,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:56:17,329 INFO L85 PathProgramCache]: Analyzing trace with hash 1706303792, now seen corresponding path program 1 times [2021-11-21 00:56:17,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:56:17,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1857519610] [2021-11-21 00:56:17,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:56:17,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:56:17,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:56:17,740 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2021-11-21 00:56:17,746 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:56:17,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1857519610] [2021-11-21 00:56:17,747 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1857519610] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:56:17,747 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:56:17,747 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 00:56:17,748 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107167126] [2021-11-21 00:56:17,748 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:56:17,749 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:56:17,749 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:56:17,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:56:17,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:56:17,750 INFO L87 Difference]: Start difference. First operand 629 states and 869 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 2 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-21 00:56:20,096 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.85s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:56:22,053 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.90s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:56:22,268 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:56:22,269 INFO L93 Difference]: Finished difference Result 1214 states and 1677 transitions. [2021-11-21 00:56:22,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:56:22,270 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 2 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) Word has length 164 [2021-11-21 00:56:22,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:56:22,283 INFO L225 Difference]: With dead ends: 1214 [2021-11-21 00:56:22,284 INFO L226 Difference]: Without dead ends: 1212 [2021-11-21 00:56:22,285 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:56:22,286 INFO L933 BasicCegarLoop]: 605 mSDtfsCounter, 485 mSDsluCounter, 548 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 485 SdHoareTripleChecker+Valid, 1073 SdHoareTripleChecker+Invalid, 177 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:56:22,287 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [485 Valid, 1073 Invalid, 177 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 4.4s Time] [2021-11-21 00:56:22,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1212 states. [2021-11-21 00:56:22,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1212 to 1211. [2021-11-21 00:56:22,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1211 states, 846 states have (on average 1.339243498817967) internal successors, (1133), 853 states have internal predecessors, (1133), 270 states have call successors, (270), 94 states have call predecessors, (270), 94 states have return successors, (270), 269 states have call predecessors, (270), 270 states have call successors, (270) [2021-11-21 00:56:22,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1211 states to 1211 states and 1673 transitions. [2021-11-21 00:56:22,380 INFO L78 Accepts]: Start accepts. Automaton has 1211 states and 1673 transitions. Word has length 164 [2021-11-21 00:56:22,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:56:22,381 INFO L470 AbstractCegarLoop]: Abstraction has 1211 states and 1673 transitions. [2021-11-21 00:56:22,382 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 2 states have call successors, (21), 2 states have call predecessors, (21), 1 states have return successors, (19), 2 states have call predecessors, (19), 2 states have call successors, (19) [2021-11-21 00:56:22,382 INFO L276 IsEmpty]: Start isEmpty. Operand 1211 states and 1673 transitions. [2021-11-21 00:56:22,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2021-11-21 00:56:22,387 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:56:22,387 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:56:22,387 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 00:56:22,388 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:56:22,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:56:22,389 INFO L85 PathProgramCache]: Analyzing trace with hash -880529444, now seen corresponding path program 1 times [2021-11-21 00:56:22,389 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:56:22,389 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [891115173] [2021-11-21 00:56:22,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:56:22,390 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:56:22,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:56:22,665 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2021-11-21 00:56:22,665 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:56:22,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [891115173] [2021-11-21 00:56:22,666 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [891115173] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:56:22,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [69932053] [2021-11-21 00:56:22,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:56:22,667 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:56:22,667 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:56:22,669 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:56:22,712 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:56:23,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:56:23,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 2042 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 00:56:23,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:56:24,096 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 120 proven. 6 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-21 00:56:24,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:56:24,704 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2021-11-21 00:56:24,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [69932053] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 00:56:24,705 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:56:24,705 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 5 [2021-11-21 00:56:24,705 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861188261] [2021-11-21 00:56:24,705 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:56:24,706 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:56:24,706 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:56:24,707 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:56:24,707 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:56:24,708 INFO L87 Difference]: Start difference. First operand 1211 states and 1673 transitions. Second operand has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 3 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) [2021-11-21 00:56:26,721 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.15s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:56:27,836 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:56:27,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:56:27,939 INFO L93 Difference]: Finished difference Result 2772 states and 3840 transitions. [2021-11-21 00:56:27,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:56:27,940 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 3 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) Word has length 170 [2021-11-21 00:56:27,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:56:27,958 INFO L225 Difference]: With dead ends: 2772 [2021-11-21 00:56:27,958 INFO L226 Difference]: Without dead ends: 1595 [2021-11-21 00:56:27,963 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 342 GetRequests, 339 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:56:27,964 INFO L933 BasicCegarLoop]: 468 mSDtfsCounter, 411 mSDsluCounter, 296 mSDsCounter, 0 mSdLazyCounter, 237 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 411 SdHoareTripleChecker+Valid, 708 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:56:27,965 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [411 Valid, 708 Invalid, 303 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 237 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2021-11-21 00:56:27,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1595 states. [2021-11-21 00:56:28,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1595 to 1593. [2021-11-21 00:56:28,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1593 states, 1126 states have (on average 1.3605683836589697) internal successors, (1532), 1135 states have internal predecessors, (1532), 330 states have call successors, (330), 136 states have call predecessors, (330), 136 states have return successors, (330), 329 states have call predecessors, (330), 330 states have call successors, (330) [2021-11-21 00:56:28,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1593 states to 1593 states and 2192 transitions. [2021-11-21 00:56:28,085 INFO L78 Accepts]: Start accepts. Automaton has 1593 states and 2192 transitions. Word has length 170 [2021-11-21 00:56:28,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:56:28,086 INFO L470 AbstractCegarLoop]: Abstraction has 1593 states and 2192 transitions. [2021-11-21 00:56:28,087 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.666666666666668) internal successors, (65), 3 states have internal predecessors, (65), 3 states have call successors, (19), 2 states have call predecessors, (19), 1 states have return successors, (18), 3 states have call predecessors, (18), 3 states have call successors, (18) [2021-11-21 00:56:28,087 INFO L276 IsEmpty]: Start isEmpty. Operand 1593 states and 2192 transitions. [2021-11-21 00:56:28,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2021-11-21 00:56:28,097 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:56:28,097 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 4, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:56:28,150 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:56:28,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:56:28,323 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:56:28,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:56:28,324 INFO L85 PathProgramCache]: Analyzing trace with hash -1519650637, now seen corresponding path program 1 times [2021-11-21 00:56:28,324 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:56:28,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1699946330] [2021-11-21 00:56:28,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:56:28,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:56:28,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:56:28,621 INFO L134 CoverageAnalysis]: Checked inductivity of 279 backedges. 18 proven. 9 refuted. 0 times theorem prover too weak. 252 trivial. 0 not checked. [2021-11-21 00:56:28,621 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:56:28,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1699946330] [2021-11-21 00:56:28,622 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1699946330] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:56:28,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1292000528] [2021-11-21 00:56:28,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:56:28,623 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:56:28,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:56:28,624 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:56:28,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:56:29,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:56:29,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 2256 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-21 00:56:29,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:56:30,115 INFO L134 CoverageAnalysis]: Checked inductivity of 279 backedges. 158 proven. 9 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-21 00:56:30,116 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:56:30,850 INFO L134 CoverageAnalysis]: Checked inductivity of 279 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 261 trivial. 0 not checked. [2021-11-21 00:56:30,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1292000528] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 00:56:30,851 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:56:30,851 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4, 4] total 5 [2021-11-21 00:56:30,852 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71334506] [2021-11-21 00:56:30,852 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:56:30,853 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:56:30,854 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:56:30,854 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:56:30,854 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:56:30,855 INFO L87 Difference]: Start difference. First operand 1593 states and 2192 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) [2021-11-21 00:56:32,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:56:32,284 INFO L93 Difference]: Finished difference Result 3664 states and 5076 transitions. [2021-11-21 00:56:32,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:56:32,288 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) Word has length 206 [2021-11-21 00:56:32,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:56:32,306 INFO L225 Difference]: With dead ends: 3664 [2021-11-21 00:56:32,306 INFO L226 Difference]: Without dead ends: 2105 [2021-11-21 00:56:32,315 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 414 GetRequests, 411 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:56:32,324 INFO L933 BasicCegarLoop]: 484 mSDtfsCounter, 415 mSDsluCounter, 284 mSDsCounter, 0 mSdLazyCounter, 237 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 415 SdHoareTripleChecker+Valid, 722 SdHoareTripleChecker+Invalid, 302 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:56:32,325 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [415 Valid, 722 Invalid, 302 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 237 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-21 00:56:32,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2105 states. [2021-11-21 00:56:32,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2105 to 2103. [2021-11-21 00:56:32,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2103 states, 1524 states have (on average 1.3799212598425197) internal successors, (2103), 1537 states have internal predecessors, (2103), 398 states have call successors, (398), 180 states have call predecessors, (398), 180 states have return successors, (398), 397 states have call predecessors, (398), 398 states have call successors, (398) [2021-11-21 00:56:32,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2103 states to 2103 states and 2899 transitions. [2021-11-21 00:56:32,490 INFO L78 Accepts]: Start accepts. Automaton has 2103 states and 2899 transitions. Word has length 206 [2021-11-21 00:56:32,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:56:32,493 INFO L470 AbstractCegarLoop]: Abstraction has 2103 states and 2899 transitions. [2021-11-21 00:56:32,493 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (24), 2 states have call predecessors, (24), 1 states have return successors, (23), 3 states have call predecessors, (23), 3 states have call successors, (23) [2021-11-21 00:56:32,493 INFO L276 IsEmpty]: Start isEmpty. Operand 2103 states and 2899 transitions. [2021-11-21 00:56:32,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2021-11-21 00:56:32,501 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:56:32,501 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:56:32,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:56:32,726 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:56:32,727 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:56:32,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:56:32,728 INFO L85 PathProgramCache]: Analyzing trace with hash -78185036, now seen corresponding path program 1 times [2021-11-21 00:56:32,728 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:56:32,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1311143018] [2021-11-21 00:56:32,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:56:32,728 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:56:32,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:56:33,064 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 312 trivial. 0 not checked. [2021-11-21 00:56:33,064 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:56:33,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1311143018] [2021-11-21 00:56:33,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1311143018] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:56:33,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1788894657] [2021-11-21 00:56:33,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:56:33,065 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:56:33,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:56:33,067 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:56:33,090 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:56:33,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:56:33,875 INFO L263 TraceCheckSpWp]: Trace formula consists of 2356 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:56:33,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:56:34,495 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 144 proven. 0 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-21 00:56:34,496 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:56:34,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1788894657] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:56:34,497 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:56:34,498 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 8 [2021-11-21 00:56:34,499 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745691975] [2021-11-21 00:56:34,499 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:56:34,500 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:56:34,504 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:56:34,505 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:56:34,505 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:56:34,505 INFO L87 Difference]: Start difference. First operand 2103 states and 2899 transitions. Second operand has 5 states, 5 states have (on average 18.0) internal successors, (90), 5 states have internal predecessors, (90), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-21 00:56:37,599 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.82s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:56:39,594 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.99s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:56:41,660 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.77s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:56:44,790 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.40s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:56:45,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:56:45,019 INFO L93 Difference]: Finished difference Result 6237 states and 8581 transitions. [2021-11-21 00:56:45,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:56:45,020 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 18.0) internal successors, (90), 5 states have internal predecessors, (90), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) Word has length 224 [2021-11-21 00:56:45,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:56:45,053 INFO L225 Difference]: With dead ends: 6237 [2021-11-21 00:56:45,053 INFO L226 Difference]: Without dead ends: 4036 [2021-11-21 00:56:45,062 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 222 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-11-21 00:56:45,065 INFO L933 BasicCegarLoop]: 911 mSDtfsCounter, 520 mSDsluCounter, 2688 mSDsCounter, 0 mSdLazyCounter, 571 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 521 SdHoareTripleChecker+Valid, 3211 SdHoareTripleChecker+Invalid, 575 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 571 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:56:45,066 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [521 Valid, 3211 Invalid, 575 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 571 Invalid, 0 Unknown, 0 Unchecked, 10.2s Time] [2021-11-21 00:56:45,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4036 states. [2021-11-21 00:56:45,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4036 to 3943. [2021-11-21 00:56:45,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3943 states, 2874 states have (on average 1.3778705636743216) internal successors, (3960), 2885 states have internal predecessors, (3960), 743 states have call successors, (743), 325 states have call predecessors, (743), 325 states have return successors, (743), 732 states have call predecessors, (743), 743 states have call successors, (743) [2021-11-21 00:56:45,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3943 states to 3943 states and 5446 transitions. [2021-11-21 00:56:45,449 INFO L78 Accepts]: Start accepts. Automaton has 3943 states and 5446 transitions. Word has length 224 [2021-11-21 00:56:45,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:56:45,450 INFO L470 AbstractCegarLoop]: Abstraction has 3943 states and 5446 transitions. [2021-11-21 00:56:45,450 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 18.0) internal successors, (90), 5 states have internal predecessors, (90), 2 states have call successors, (27), 2 states have call predecessors, (27), 2 states have return successors, (26), 2 states have call predecessors, (26), 2 states have call successors, (26) [2021-11-21 00:56:45,450 INFO L276 IsEmpty]: Start isEmpty. Operand 3943 states and 5446 transitions. [2021-11-21 00:56:45,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2021-11-21 00:56:45,462 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:56:45,462 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:56:45,514 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:56:45,678 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:56:45,679 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:56:45,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:56:45,679 INFO L85 PathProgramCache]: Analyzing trace with hash 37320089, now seen corresponding path program 1 times [2021-11-21 00:56:45,680 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:56:45,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2010779812] [2021-11-21 00:56:45,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:56:45,680 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:56:45,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:56:46,003 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 374 trivial. 0 not checked. [2021-11-21 00:56:46,003 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:56:46,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2010779812] [2021-11-21 00:56:46,004 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2010779812] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:56:46,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1230489253] [2021-11-21 00:56:46,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:56:46,005 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:56:46,005 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:56:46,006 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:56:46,026 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:56:46,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:56:46,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 2503 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 00:56:46,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:56:47,599 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 219 proven. 18 refuted. 0 times theorem prover too weak. 149 trivial. 0 not checked. [2021-11-21 00:56:47,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:56:48,443 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2021-11-21 00:56:48,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1230489253] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-21 00:56:48,443 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-21 00:56:48,444 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5, 5] total 10 [2021-11-21 00:56:48,445 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713762704] [2021-11-21 00:56:48,445 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:56:48,447 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:56:48,448 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:56:48,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:56:48,448 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:56:48,449 INFO L87 Difference]: Start difference. First operand 3943 states and 5446 transitions. Second operand has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 3 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) [2021-11-21 00:56:51,527 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.58s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:56:52,794 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.27s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:56:52,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:56:52,989 INFO L93 Difference]: Finished difference Result 8941 states and 12467 transitions. [2021-11-21 00:56:52,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:56:52,990 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 3 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) Word has length 236 [2021-11-21 00:56:52,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:56:53,031 INFO L225 Difference]: With dead ends: 8941 [2021-11-21 00:56:53,032 INFO L226 Difference]: Without dead ends: 5032 [2021-11-21 00:56:53,046 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 475 GetRequests, 467 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:56:53,047 INFO L933 BasicCegarLoop]: 564 mSDtfsCounter, 523 mSDsluCounter, 615 mSDsCounter, 0 mSdLazyCounter, 683 mSolverCounterSat, 82 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 542 SdHoareTripleChecker+Valid, 1057 SdHoareTripleChecker+Invalid, 765 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 82 IncrementalHoareTripleChecker+Valid, 683 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:56:53,047 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [542 Valid, 1057 Invalid, 765 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [82 Valid, 683 Invalid, 0 Unknown, 0 Unchecked, 4.3s Time] [2021-11-21 00:56:53,057 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5032 states. [2021-11-21 00:56:53,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5032 to 4141. [2021-11-21 00:56:53,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4141 states, 3060 states have (on average 1.3908496732026143) internal successors, (4256), 3071 states have internal predecessors, (4256), 749 states have call successors, (749), 331 states have call predecessors, (749), 331 states have return successors, (749), 738 states have call predecessors, (749), 749 states have call successors, (749) [2021-11-21 00:56:53,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4141 states to 4141 states and 5754 transitions. [2021-11-21 00:56:53,363 INFO L78 Accepts]: Start accepts. Automaton has 4141 states and 5754 transitions. Word has length 236 [2021-11-21 00:56:53,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:56:53,364 INFO L470 AbstractCegarLoop]: Abstraction has 4141 states and 5754 transitions. [2021-11-21 00:56:53,365 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 22.0) internal successors, (88), 4 states have internal predecessors, (88), 3 states have call successors, (26), 2 states have call predecessors, (26), 1 states have return successors, (25), 3 states have call predecessors, (25), 3 states have call successors, (25) [2021-11-21 00:56:53,365 INFO L276 IsEmpty]: Start isEmpty. Operand 4141 states and 5754 transitions. [2021-11-21 00:56:53,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2021-11-21 00:56:53,375 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:56:53,375 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:56:53,425 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:56:53,590 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:56:53,591 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:56:53,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:56:53,591 INFO L85 PathProgramCache]: Analyzing trace with hash 820364439, now seen corresponding path program 1 times [2021-11-21 00:56:53,591 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:56:53,591 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [995858410] [2021-11-21 00:56:53,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:56:53,592 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:56:53,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:56:53,926 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 374 trivial. 0 not checked. [2021-11-21 00:56:53,926 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:56:53,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [995858410] [2021-11-21 00:56:53,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [995858410] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:56:53,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1900803557] [2021-11-21 00:56:53,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:56:53,927 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:56:53,927 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:56:53,928 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:56:53,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:56:54,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:56:54,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 2568 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 00:56:54,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:56:55,365 INFO L134 CoverageAnalysis]: Checked inductivity of 386 backedges. 79 proven. 0 refuted. 0 times theorem prover too weak. 307 trivial. 0 not checked. [2021-11-21 00:56:55,366 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:56:55,366 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1900803557] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:56:55,367 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:56:55,367 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2021-11-21 00:56:55,368 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427685964] [2021-11-21 00:56:55,369 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:56:55,369 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:56:55,370 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:56:55,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:56:55,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:56:55,371 INFO L87 Difference]: Start difference. First operand 4141 states and 5754 transitions. Second operand has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 3 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (26), 3 states have call predecessors, (26), 3 states have call successors, (26) [2021-11-21 00:56:58,279 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.64s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:56:59,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:56:59,210 INFO L93 Difference]: Finished difference Result 9124 states and 12879 transitions. [2021-11-21 00:56:59,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:56:59,212 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 3 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (26), 3 states have call predecessors, (26), 3 states have call successors, (26) Word has length 238 [2021-11-21 00:56:59,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:56:59,253 INFO L225 Difference]: With dead ends: 9124 [2021-11-21 00:56:59,253 INFO L226 Difference]: Without dead ends: 5017 [2021-11-21 00:56:59,267 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 242 GetRequests, 237 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:56:59,268 INFO L933 BasicCegarLoop]: 712 mSDtfsCounter, 379 mSDsluCounter, 554 mSDsCounter, 0 mSdLazyCounter, 552 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 387 SdHoareTripleChecker+Valid, 1158 SdHoareTripleChecker+Invalid, 609 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 552 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:56:59,269 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [387 Valid, 1158 Invalid, 609 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 552 Invalid, 0 Unknown, 0 Unchecked, 3.6s Time] [2021-11-21 00:56:59,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5017 states. [2021-11-21 00:56:59,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5017 to 4605. [2021-11-21 00:56:59,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4605 states, 3500 states have (on average 1.3908571428571428) internal successors, (4868), 3511 states have internal predecessors, (4868), 761 states have call successors, (761), 343 states have call predecessors, (761), 343 states have return successors, (761), 750 states have call predecessors, (761), 761 states have call successors, (761) [2021-11-21 00:56:59,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4605 states to 4605 states and 6390 transitions. [2021-11-21 00:56:59,633 INFO L78 Accepts]: Start accepts. Automaton has 4605 states and 6390 transitions. Word has length 238 [2021-11-21 00:56:59,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:56:59,634 INFO L470 AbstractCegarLoop]: Abstraction has 4605 states and 6390 transitions. [2021-11-21 00:56:59,634 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 24.25) internal successors, (97), 4 states have internal predecessors, (97), 3 states have call successors, (27), 3 states have call predecessors, (27), 3 states have return successors, (26), 3 states have call predecessors, (26), 3 states have call successors, (26) [2021-11-21 00:56:59,634 INFO L276 IsEmpty]: Start isEmpty. Operand 4605 states and 6390 transitions. [2021-11-21 00:56:59,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2021-11-21 00:56:59,647 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:56:59,647 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:56:59,698 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:56:59,862 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:56:59,863 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:56:59,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:56:59,864 INFO L85 PathProgramCache]: Analyzing trace with hash -460643796, now seen corresponding path program 1 times [2021-11-21 00:56:59,864 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:56:59,864 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294721090] [2021-11-21 00:56:59,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:56:59,864 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:57:00,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:00,243 INFO L134 CoverageAnalysis]: Checked inductivity of 426 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 412 trivial. 0 not checked. [2021-11-21 00:57:00,244 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:57:00,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [294721090] [2021-11-21 00:57:00,244 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [294721090] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:57:00,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1109997868] [2021-11-21 00:57:00,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:00,245 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:57:00,245 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:57:00,246 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:57:00,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:57:01,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:01,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 2850 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-21 00:57:01,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:57:01,908 INFO L134 CoverageAnalysis]: Checked inductivity of 426 backedges. 107 proven. 0 refuted. 0 times theorem prover too weak. 319 trivial. 0 not checked. [2021-11-21 00:57:01,909 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:57:01,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1109997868] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:57:01,909 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:57:01,910 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [5] total 9 [2021-11-21 00:57:01,910 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2066136590] [2021-11-21 00:57:01,910 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:57:01,911 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:57:01,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:57:01,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:57:01,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:57:01,913 INFO L87 Difference]: Start difference. First operand 4605 states and 6390 transitions. Second operand has 7 states, 6 states have (on average 19.0) internal successors, (114), 5 states have internal predecessors, (114), 2 states have call successors, (33), 2 states have call predecessors, (33), 4 states have return successors, (32), 4 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-21 00:57:04,087 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.10s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:57:05,270 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.18s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:57:07,292 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:57:09,166 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.87s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:57:10,742 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.58s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:57:11,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:57:11,223 INFO L93 Difference]: Finished difference Result 10209 states and 14303 transitions. [2021-11-21 00:57:11,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:57:11,224 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 19.0) internal successors, (114), 5 states have internal predecessors, (114), 2 states have call successors, (33), 2 states have call predecessors, (33), 4 states have return successors, (32), 4 states have call predecessors, (32), 2 states have call successors, (32) Word has length 274 [2021-11-21 00:57:11,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:57:11,270 INFO L225 Difference]: With dead ends: 10209 [2021-11-21 00:57:11,270 INFO L226 Difference]: Without dead ends: 5638 [2021-11-21 00:57:11,283 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 278 GetRequests, 271 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-11-21 00:57:11,284 INFO L933 BasicCegarLoop]: 639 mSDtfsCounter, 135 mSDsluCounter, 3495 mSDsCounter, 0 mSdLazyCounter, 559 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 155 SdHoareTripleChecker+Valid, 3692 SdHoareTripleChecker+Invalid, 560 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 559 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:57:11,285 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [155 Valid, 3692 Invalid, 560 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 559 Invalid, 1 Unknown, 0 Unchecked, 9.1s Time] [2021-11-21 00:57:11,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5638 states. [2021-11-21 00:57:11,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5638 to 4629. [2021-11-21 00:57:11,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4629 states, 3516 states have (on average 1.3890784982935154) internal successors, (4884), 3527 states have internal predecessors, (4884), 761 states have call successors, (761), 343 states have call predecessors, (761), 351 states have return successors, (781), 758 states have call predecessors, (781), 761 states have call successors, (781) [2021-11-21 00:57:11,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4629 states to 4629 states and 6426 transitions. [2021-11-21 00:57:11,601 INFO L78 Accepts]: Start accepts. Automaton has 4629 states and 6426 transitions. Word has length 274 [2021-11-21 00:57:11,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:57:11,602 INFO L470 AbstractCegarLoop]: Abstraction has 4629 states and 6426 transitions. [2021-11-21 00:57:11,604 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 19.0) internal successors, (114), 5 states have internal predecessors, (114), 2 states have call successors, (33), 2 states have call predecessors, (33), 4 states have return successors, (32), 4 states have call predecessors, (32), 2 states have call successors, (32) [2021-11-21 00:57:11,604 INFO L276 IsEmpty]: Start isEmpty. Operand 4629 states and 6426 transitions. [2021-11-21 00:57:11,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 279 [2021-11-21 00:57:11,621 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:57:11,621 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:57:11,675 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:57:11,837 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:57:11,837 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:57:11,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:57:11,838 INFO L85 PathProgramCache]: Analyzing trace with hash 2044380419, now seen corresponding path program 1 times [2021-11-21 00:57:11,838 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:57:11,838 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1320758235] [2021-11-21 00:57:11,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:11,839 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:57:11,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:12,149 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 428 trivial. 0 not checked. [2021-11-21 00:57:12,149 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:57:12,149 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1320758235] [2021-11-21 00:57:12,150 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1320758235] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:57:12,150 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [808381958] [2021-11-21 00:57:12,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:12,150 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:57:12,151 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:57:12,152 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:57:12,170 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:57:13,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:13,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 2871 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-21 00:57:13,109 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:57:13,734 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 196 proven. 0 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2021-11-21 00:57:13,734 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:57:13,735 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [808381958] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:57:13,735 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:57:13,735 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2021-11-21 00:57:13,736 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487744745] [2021-11-21 00:57:13,736 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:57:13,737 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:57:13,737 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:57:13,737 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:57:13,737 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-21 00:57:13,738 INFO L87 Difference]: Start difference. First operand 4629 states and 6426 transitions. Second operand has 4 states, 3 states have (on average 37.0) internal successors, (111), 4 states have internal predecessors, (111), 2 states have call successors, (35), 2 states have call predecessors, (35), 3 states have return successors, (34), 2 states have call predecessors, (34), 2 states have call successors, (34) [2021-11-21 00:57:15,631 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.14s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:57:16,658 WARN L515 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.03s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-21 00:57:17,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:57:17,386 INFO L93 Difference]: Finished difference Result 9238 states and 12829 transitions. [2021-11-21 00:57:17,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:57:17,387 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 37.0) internal successors, (111), 4 states have internal predecessors, (111), 2 states have call successors, (35), 2 states have call predecessors, (35), 3 states have return successors, (34), 2 states have call predecessors, (34), 2 states have call successors, (34) Word has length 278 [2021-11-21 00:57:17,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:57:17,418 INFO L225 Difference]: With dead ends: 9238 [2021-11-21 00:57:17,418 INFO L226 Difference]: Without dead ends: 4630 [2021-11-21 00:57:17,432 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 277 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-21 00:57:17,433 INFO L933 BasicCegarLoop]: 484 mSDtfsCounter, 1 mSDsluCounter, 1119 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 1440 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2021-11-21 00:57:17,434 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 1440 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 260 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2021-11-21 00:57:17,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4630 states. [2021-11-21 00:57:17,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4630 to 4630. [2021-11-21 00:57:17,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4630 states, 3517 states have (on average 1.3889678703440431) internal successors, (4885), 3528 states have internal predecessors, (4885), 761 states have call successors, (761), 343 states have call predecessors, (761), 351 states have return successors, (781), 758 states have call predecessors, (781), 761 states have call successors, (781) [2021-11-21 00:57:17,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4630 states to 4630 states and 6427 transitions. [2021-11-21 00:57:17,691 INFO L78 Accepts]: Start accepts. Automaton has 4630 states and 6427 transitions. Word has length 278 [2021-11-21 00:57:17,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:57:17,693 INFO L470 AbstractCegarLoop]: Abstraction has 4630 states and 6427 transitions. [2021-11-21 00:57:17,694 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 37.0) internal successors, (111), 4 states have internal predecessors, (111), 2 states have call successors, (35), 2 states have call predecessors, (35), 3 states have return successors, (34), 2 states have call predecessors, (34), 2 states have call successors, (34) [2021-11-21 00:57:17,694 INFO L276 IsEmpty]: Start isEmpty. Operand 4630 states and 6427 transitions. [2021-11-21 00:57:17,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 284 [2021-11-21 00:57:17,743 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:57:17,743 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 5, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:57:17,805 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:57:17,958 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 00:57:17,959 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION === [ldv_check_ttyErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:57:17,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:57:17,960 INFO L85 PathProgramCache]: Analyzing trace with hash -917394235, now seen corresponding path program 1 times [2021-11-21 00:57:17,960 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:57:17,960 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [169410972] [2021-11-21 00:57:17,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:17,961 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:57:18,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:18,265 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 463 trivial. 0 not checked. [2021-11-21 00:57:18,265 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:57:18,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [169410972] [2021-11-21 00:57:18,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [169410972] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:57:18,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1099322435] [2021-11-21 00:57:18,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:18,266 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:57:18,267 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:57:18,267 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:57:18,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_69750317-91f1-4d84-840a-163e41e6a944/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 00:57:19,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:19,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 2901 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 00:57:19,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:57:20,104 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 208 proven. 1 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2021-11-21 00:57:20,104 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:57:20,933 INFO L134 CoverageAnalysis]: Checked inductivity of 477 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 456 trivial. 0 not checked. [2021-11-21 00:57:20,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1099322435] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:57:20,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1540803273] [2021-11-21 00:57:20,966 INFO L159 IcfgInterpreter]: Started Sifa with 141 locations of interest [2021-11-21 00:57:20,967 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:57:20,973 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:57:20,981 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:57:20,994 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:57:48,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:57:48,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:57:48,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:57:48,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:57:48,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:57:48,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:57:48,880 INFO L244 Elim1Store]: Index analysis took 836 ms [2021-11-21 01:00:00,692 WARN L227 SmtUtils]: Spent 2.20m on a formula simplification. DAG size of input: 3175 DAG size of output: 1416 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-21 01:00:00,708 INFO L354 Elim1Store]: treesize reduction 11844, result has 17.5 percent of original size [2021-11-21 01:00:00,712 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 107 select indices, 107 select index equivalence classes, 5161 disjoint index pairs (out of 5671 index pairs), introduced 107 new quantified variables, introduced 618 case distinctions, treesize of input 594 treesize of output 2897 [2021-11-21 01:01:17,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:01:17,840 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:01:17,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:01:17,844 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:01:17,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:01:17,885 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 101 select indices, 101 select index equivalence classes, 5569 disjoint index pairs (out of 5050 index pairs), introduced 101 new quantified variables, introduced 0 case distinctions, treesize of input 524 treesize of output 834